"The Corpus", from Anarchism Is Not Enough (London: Jonathan Cape, 1928)
“Solidarity is not a matter of sentiment but a fact, cold and impassive as the granite foundations of a skyscraper. If the basic elements, identity of interest, clarity of vision, honesty of intent, and oneness of purpose, or any of these is lacking, all sentimental pleas for solidarity, and all other efforts to achieve it will be barren of results.”
"A Plea for Solidarity," The International Socialist Review VOL XIV No. 9 (March 1914) https://books.google.com/books?id=olFIAAAAYAAJ&lpg=PA534&ots=GTTSOWeGxG&dq=eugene%20v.%20debs%20%22a%20plea%20for%20solidarity&pg=PA534#v=onepage&q&f=false
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Eugene V. Debs 108
American labor and political leader 1855–1926Related quotes

Radio Address to the Nation on Solidarity and United States Relations With Poland http://www.presidency.ucsb.edu/ws/index.php?pid=43110#axzz1Go825Y2t (1982-10-09). Compare with an earlier Reagan speech: "... where free unions and collective bargaining are forbidden, freedom is lost. They remind us that freedom is never more than one generation away from extinction." Labor Day Speech at Liberty State Park, Jersey City, New Jersey, September 1, 1980 http://www.reagan.utexas.edu/archives/reference/9.1.80.html
1980s, First term of office (1981–1985)

“Like all harsh, cold men, he was easily tipped over into sentiment.”
Source: Casino Royale

Brexit: EU stands fully behind Ireland, says Barnier https://www.bbc.co.uk/news/world-europe-47847700 BBC News (8 April 2019)
2017, 2019

Source: 1930s, Adventures of Ideas (1933), p. 91.
Context: In the study of ideas, it is necessary to remember that insistence on hard-headed clarity issues from sentimental feeling, as if it were a mist, cloaking the perplexities of fact. Insistence on clarity at all costs is based on sheer superstition as to the mode in which human intelligence functions. Our reasoning grasps at straws for premises and float on gossamer for deductions.

Quote from 'On the Possibilities of Painting,' lecture, Sorbonne (1924-05-15)